The Volvo tractor-trailer was heading east when it collided with an Isuzu box truck around 1:50 p.m. near milepost 15.4 in Union Township (Hunterdon County), NJSP Detective I Jeffrey Lebron said.
The Volvo tractor-trailer continued forward and subsequently struck one troop car, which caused a chain reaction with the three other vehicles.
As a result of the crash, one trooper sustained minor injuries and was transported to a nearby hospital.
Passing drivers reported seeing troopers standing outside the vehicles conducting an investigation with a motorist, however, police did not confirm this information.
The crash is under investigation.
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